Can you imagine how awkward it would be if your ex’s dad snuck into a party you were hosting?

Nick Lachey and Joe Simpson had a very awkward run-in Feb. 4 during the Super Bowl festivities in Miami! Nick, who was was famously married to Jessica Simpson from 2002 to 2005, hosted the Super Skins kick-off charity party at Hotel 944 at Eden Roc, and insiders tell us, his ex father-in-law, Joe Simpson, “crashed the party!” The insider says, “Joe was staying at the Eden Roc hotel, and he was not invited to Nick’s party. But he just walked right in!” Nick was overheard saying, “I haven’t talked to him in a long time” and the spy says the former in-laws “completely avoided each other.”

“Nick doesn’t know I’m here!” Joe admitted to party goers as he waltzed in to the bash early, OK! magazine reports. “Joe went up the elevator to the party before Nick, and tried to slip in unnoticed.”

Smooth move, Mr. Simpson.

It’s rumored that Joe — who is notorious for being hyper-involved in his daughter’s lives — was a major reason Jessica, 29, and Nick, 36, split in Nov. 2005 after being married for three years.

So how did the former 98 Degrees singer react to seeing his former father-in-law? “I haven’t talked to Joe in years,” Nick said. “So be it.” After receiving enough odd looks, Joe went to Jose Cuervo Platino Penthouse upstairs, while Nick stayed w Eli Manning and his longtime girlfriend Vanessa Minillo.

And Nick has such a charitable side! After hosting the charity party Thursday, Nick and NASCAR champ Jimmie Johnson hosted the Super Skins Celebirty Golf Classic at The Biltmore Hotel & Golf Club on Saturday.